Viscoelastoplastic Damage Characterization of Asphalt–Aggregate Mixtures Using Digital Image Correlation
Publication: International Journal of Geomechanics
Volume 7, Issue 2
Abstract
This paper presents the research effort in which the viscoelastoplastic continuum damage (VEPCD) model is developed and calibrated for the behavioral prediction of asphalt–aggregate mixtures subjected to tensile stresses in pavement structures. It is found that the formation of strains in the mixtures becomes highly localized as microcracks densify, coalesce, and further grow to develop into macrocracks. However, conventional linear variable differential transformers (LVDTs) used in most laboratory tests are unable to capture the localized process zone strains [or fracture process zone (FPZ) strains] due to various limitations. Consequently, the VEPCD model, calibrated using LVDT measurements, ceases to accurately predict the performance of asphalt–aggregate mixtures after the strain localization. This study explores the use of a digital image correlation (DIC) technique for measuring the FPZ strains in an aim to extend the validity of the VEPCD model beyond localization. An experimental/analytical methodology that requires transfer from LVDT strains to DIC strains after strain localization for model calibration and validation is presented for a range of loading and temperature conditions.
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Acknowledgments
The National Science Foundation (NSF) and NCHRP funded this work. It is part of the NCHRP 9-19 project sponsored by the American Association of State Highway and Transportation Officials, in cooperation with the Federal Highway Administration, and was conducted in the National Cooperative Highway Research Program, which is administered by the Transportation Research Board of the National Research Council. The writers gratefully acknowledge this support. This material is based upon work supported by the National Science Foundation under Grant No. 9812741. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writer(s) and do not necessarily reflect the views of the National Science Foundation, Transportation Research Board, the National Research Council, the Federal Highway Administration, the American Association of State Highway and Transportation Officials, or the individual states participating in the National Cooperative Highway Research Program.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 7 • Issue 2 • March 2007
Pages: 111 - 118
Copyright
© 2007 ASCE.
History
Received: Jun 6, 2006
Accepted: Jun 9, 2006
Published online: Mar 1, 2007
Published in print: Mar 2007
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